Fixed-Parameter Complexity of Minimum Profile Problems

The profile of a graph is an integer-valued parameter defined via vertex orderings; it is known that the profile of a graph equals the smallest number of edges of an interval supergraph. Since computing the profile of a graph is an NP-hard problem, we consider parameterized versions of the problem....

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Veröffentlicht in:Algorithmica Jg. 52; H. 2; S. 133 - 152
Hauptverfasser: Gutin, Gregory, Szeider, Stefan, Yeo, Anders
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York Springer-Verlag 01.10.2008
Schlagworte:
Algorithm Analysis and Problem Complexity
Algorithms
Computer Science
Computer Systems Organization and Communication Networks
Data Structures and Information Theory
Mathematics of Computing
Theory of Computation
Graph profile
Above guaranteed value
Kernel
Fixed parameter tractability
ISSN:0178-4617, 1432-0541
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Zusammenfassung:The profile of a graph is an integer-valued parameter defined via vertex orderings; it is known that the profile of a graph equals the smallest number of edges of an interval supergraph. Since computing the profile of a graph is an NP-hard problem, we consider parameterized versions of the problem. Namely, we study the problem of deciding whether the profile of a connected graph of order n is at most n −1+ k , considering k as the parameter; this is a parameterization above guaranteed value, since n −1 is a tight lower bound for the profile. We present two fixed-parameter algorithms for this problem. The first algorithm is based on a forbidden subgraph characterization of interval graphs. The second algorithm is based on two simple kernelization rules which allow us to produce a kernel with linear number of vertices and edges. For showing the correctness of the second algorithm we need to establish structural properties of graphs with small profile which are of independent interest.
ISSN:0178-4617
1432-0541
DOI:10.1007/s00453-007-9144-0